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STORAGE PROPERTIES - Summary (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
STORAGE FACILITIES |  |  |
Storage properties | $ 7,183,494 | $ 5,489,754 |
Less: Accumulated depreciation | (1,085,824) | (983,940) |
Storage properties, net (including VIE assets of $149,467 and $119,345, respectively) | 6,097,670 | 4,505,814 | $ 3,774,485
Land |  |  |
STORAGE FACILITIES |  |  |
Storage properties | 1,565,463 | 1,093,503 |
Buildings and improvements |  |  |
STORAGE FACILITIES |  |  |
Storage properties | 5,368,383 | 4,122,995 |
Equipment |  |  |
STORAGE FACILITIES |  |  |
Storage properties | 129,531 | 123,044 |
Construction in progress |  |  |
STORAGE FACILITIES |  |  |
Storage properties | 78,221 | 108,316 |
Right-of-use assets - finance leases |  |  |
STORAGE FACILITIES |  |  |
Storage properties | $ 41,896 | $ 41,896 |

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- Definition The cumulative amount of depreciation for real estate property held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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